About 3mL of the wash water is collected in a small test tube. A few drops of 0.1M silver nitrate solution is added to the water to test for the presences of Cl- ions. Lastly the filter paper was placed in the dry oven to dry completely and then weighted. Calculations and observations were made and recorded. Observations The
That is why once you add the benzoic acid aqueous solution and the CH2Cl2 in the separatory funnel the benzoic acid moves from the aqueous layer into the methylene chloride organic layer. This will occur until an equilibrium is establish between the aqueous layer and the organic layer; that is there is an equal amount of benzoic acid in the aqueous layer and the organic
Stoichiometry of Reactions in Solution I. Introduction: Stoichiometry of reactions in solution applied stoichiometry and the idea of a limiting reactant to a reaction in solution. This experiment involved performing aqueous acid and base titrations to determine the mole ratios of four different acid base reactions. Titration is one compound added to a known amount of another compound quantitatively and reacted together to completion (the solution turn pink at the end point). The end point is also called the neutralization point, which means that all the acid has reacted completely with the base and the solution has been neutralized.
Observe after at least 5 minutes. For a closer examination, use the glass rod, popsicle stick or toothpick to hook the precipitate. * Step 6 – Pour the liquids down the sink and clean the rest of the equipment. Read more at Suite101: How to Extract DNA From Fruit and Vegetables: A Home Experiment for Viewing Real Deoxyribonkucleic Acid http://www.suite101.com/content/how-to-extract-dna-from-fruit-and-vegetables-a76806#ixzz1EkVq2LaJ Theory The mashing breaks the cells apart. The detergent breaks them open, freeing the cell contents (including the DNA).
After heating, the mixture was cooled to room temperature and filtered by vacuum filtration into a fritted funnel to yield a purple product. The product was washed 3 times with (5mL) portions of chilled 6M HCL, then Ethanol, and lastly with acetone. The resulting product was placed into a vial and left to dry in a vacuum desiccator for 1 week and weighed the next week. The yield was 6.029g. The second experiment, procedure 1, combined [Co(NH3)5 (H2O)]Cl2 (0.0060M, 1.52g) and (25mL) of distilled water to an 125mL Erlenmeyer flask.
Liquid resins are converted into insoluble and infusible solids through oxirane reactions. The oxirane structure is referred as epoxy functionality. The resin used in the experiment has a functionality of two. Resins are usually prepared with the reactions of bisphenols –and generally commercially bisphenol A- with epichlorohydrin or glycidyl chloride. Epoxy resins are generally cured with primary/secondary polyamines, anhydrides, and polyamides.
Microcalorimetry experiment was performed on Setaram−C80 heat flow calorimeter coupled to a multiport high-vacuum homemade glass manifold. A specific amount of the sample (approx. 500 mg) was taken into a sample cell, reference cell was taken as empty and together they are connected with Pyrex tee. The sample was heated from room temperature to 200°C under vacuum and kept for 2 h, then 3-4 doses of helium gas were introduced into the system to remove any excess residue such as moisture or organic impurity from the system. The system was heated for 4-5 hr under vacuum at 200°C and then cooled down to the temperature (50°C) where we want to perform the adsorption study.
The third test will utilize thin layer chromatography to evaluate the purity of the aspirin as well as testing for the presence of leftover salicylic acid or other by products of the reactions. Experimental: Week 1: For the synthesis of the aspirin, 250 mL of water was boiled. 1.5 g. of salicylic acid were poured on a test tube. Then, 3.5 mL of acetic anhydride and four drops of 85% phosphoric acid were added. A cotton ball was placed to prevent vapor escape.
Athena Cochinamogulos Dr. Miller Organic Chemistry II October 23, 13 Title: Suzuki Palladium Cross-Coupling Reaction: Synthesis of 4-Acetyl-4-methyldiphenyl Abstract: In this experiment, the Suzuki Cross coupling reaction between 4-methylphenylboronic acid and 4-bromoacetophenone was utilized to prepare 1-(4’methyl-biphenyl-4-yl) ethanone. Purification through vacuum filtration was carried out and rotary evaporation was executed. The characterization of the purified product was determined by comparing its spectra and melting points to those presented in the literature. The melting point of the product was 58-70°C; which largely differs from the literature value suggesting impurities but the use of spectra data allowed for the determination of product and overall experimental successful. Reaction Equation: Introduction: An organic reaction of an aryl- or vinyl-boronic acid with an aryl- or vinyl-halide catalyzed by a palladium (0) complex or by a palladium nanomaterial-based catalyst describes the Suzuki reaction first reported by Miyaura, Yanagi, and Suzuki in 1981.
They are prepared by reacting magnesium turnings with an alkyl halide or an aryl halide, usually in ether solvent. Grignard reagents are important in the synthesis of alcohols. Reacting a Grignard with formaldehyde will produce a primary alcohol. The reaction between a Grignard and other aldehydes will yield a secondary alcohol. A tertiary alcohol will be the product of the reaction between a Grignard and a ketone.